Developers and designers have loved the WebDeveloper extension from Chris Pederick. The one thing that is missing was some more extensive XML support.
The XML Developer Firefox extension is an excellent way to continue the work of Mr. Pederick and allow developers/designers to pursue the XML path ('scuse the pun).
The extension provides the following categories on the toolbar:
Those who work with web services and XML will really appreciate the amount of time that went into this extension.
If you already have the Web Developer extension, you won't visit the Styles option at all. Its strictly CSS viewing and editing. Under SOA, there is a WSDL Analyzer along with a SOAP Envelope and I know this option will be used thoroughly by developers. Under Tools, you'll find XPath, Generate Schema, and Generate DTD.
After using this extension for a while, it makes XML usage more bearable to work with while hiding it after your finished.
Installation was simple and I've experienced no errors whatsoever. Overall, an exceptional utility for developers who work extensively with XML. Nice Job!